jared bernstein served as chief economist and adviser to vice president biden from 2009 to 2011. he's now a senior fellow at the center on budget and policy priorities. douglas holtz-akin is a former director of the congressional budget office. he was chief economics adviser to john mccain's presidential campaign and is now president of the american action forum, a policy think tank. neither holds an official position with the current campaigns. jared, i want to stewart the $5 trillion number because there's a dispute over it, where it came from, what is the president referring to? >> mitt romney has proposed to cut taxes across the board by 20%. cut tax rates, i should be precise about that, because it matters. you lose $5 trillion in revenue over ten years if you cut tax rates by 20% across the board. that's the calculation of a non-partisan group widely agreed to be accurate, the tax policy center. now, here's where things get complicated because what the --. >> brown: you're going tligt there right away, aren't you? (laughter) >> it's like we're up there on the stage last nig